Can you achieve greater speed / horsepower with real gas?

I am sure this has probably been answered somewhere before. But, if your fuel pump and injectors can only flow X amount of volume at full throttle, will a boat go faster using real gas of the same octane vs. fuel that has ethanol?

Along with all of the other ethanol related documented issues, I have read that real gas has more usable energy per volume than ethanol. So is thinking correct that at max. capable fuel flow that you will get more performance out of your boat with real gas?

I'm sure other people have this question. Does using a product like Star-Tron or buying gas with a Valvtect additive keep the ethanol from causing problems in boats with fiberglass fuel tanks? I'm looking at a boat that might have a glass tank.